VS: Simplify MSVC version reporting

Teach Windows-cl.cmake to use CMAKE_(C|CXX)_COMPILER_VERSION to set the
"MSVC##" and MSVC_VERSION variables.  It no longer needs the IDE generator
to dictate the version or to detect the version by running the
command-line tool for NMake and Ninja generators.  Drop configuration of
CMakeCPlatform.cmake and CMakeCXXPlatform.cmake from Windows-cl.cmake.in
because all the results it saved are now cheap to compute every time.

1 files changed, 0 insertions, 1 deletions

diff --git a/Source/cmGlobalVisualStudioGenerator.h b/Source/cmGlobalVisualStudioGenerator.h
index a042dc0..cebf7d7 100644
--- a/Source/cmGlobalVisualStudioGenerator.h
+++ b/Source/cmGlobalVisualStudioGenerator.h
@@ -99,7 +99,6 @@ protected:
   typedef std::map<cmTarget*, cmStdString> UtilityDependsMap;
   UtilityDependsMap UtilityDepends;
   const char* ArchitectureId;
-  const char* VersionId;
 
 private:
   void ComputeTargetObjects(cmGeneratorTarget* gt) const;